999728 has 10 divisors (see below), whose sum is σ = 1937004. Its totient is φ = 499856.

The previous prime is 999727. The next prime is 999749. The reversal of 999728 is 827999.

It is not an unprimeable number, because it can be changed into a prime (999721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31226 + ... + 31257.

2⁹⁹⁹⁷²⁸ is an apocalyptic number.

It is an amenable number.

999728 is a deficient number, since it is larger than the sum of its proper divisors (937276).

999728 is a wasteful number, since it uses less digits than its factorization.

999728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62491 (or 62485 counting only the distinct ones).

The product of its digits is 81648, while the sum is 44.

The square root of 999728 is about 999.8639907507. The cubic root of 999728 is about 99.9909325112.

The spelling of 999728 in words is "nine hundred ninety-nine thousand, seven hundred twenty-eight".